Centrifugal pump.



Patented July 9, l90l.

.. no. 678,l98.

(No Model.)

NMQ

S. M w W W v UNITED STATES I PATENT -OFFICE.

JOHN RICHARDS, on s'AN FRANCISCO, CALIFORNIA.

CENTRIFUGAL PUMP.-

SPECIFICATION forming part of Letters Patent No. 678,198, dated July 9, 1901.

i Application filedseptember 4, 1900. Serial No. 28,907. (No model.)

forming a part of this specification.

This invention relates to centrifugal apparatus for raising and impelling Water or other liquids and to certain improvements therein.

The improvements consist in a rapidly-re volving hollow disk or chamber having vanes therein and a continuousand converging di scharge-throat that coincides with a fixed receiving throat or nozzle extending around the disk or impeller, the two producing inductive action in the manner of an ejector or injector.

The objects of the invention'are to avoid the inclosure of the impeller in a sealed chamber and its immersion in the fluid being raised or forced and the consequent friction on the outer surface of the impeller, to dispense with an inclosing case at the sides of the impeller, and to attain a higher speed-and pressure than is attainable in acommon centrifugal pump. To this end I provide devices as shown in the drawings herewith and forming a part of this specification.

FigureI is a side view of a Water raising or forcing machine constructed according to my invention, the supply or inlet pipe being removed. Fig. II is a verticalsection through the same machine parallel to the axis of rotation and 'at an angle of ninety degrees from Fig. Land Fig. III an enlarged diagram of the throat or discharge and inlet ways around the impeller.

In raising and impelling fluids with centrifugal apparatus a principal impediment to economical working is the resistance of water friction either on the exterior of submerged impellers or because of Water set in rotation within the interior of a chamber when the water revolves with the impelling'devices; also, because of the tips of the vanes extending to the water in the discharge-casing. Such resistance varies as some function of the pressure and velocity. To prevent backflow from the dischargechamber, to avoid such water friction, and for other reasons, I construct apparatus as shown in the drawings, the essential parts being a rotary impeller 1, having a continuous contracted peripheralvent 2, corresponding to the nozzle of an ejector or injector, a corresponding contracted throat 3, opening into an annulardischargechamber 4, set concentricwith and in exact alinemen't with the discharge-wayof the rotary impeller 1. A

The impeller l is mounted on aspindle 5,

adapted to be driven at high speed, and ex ternally is open to the air and out of contact I v r with the fluid being raisedor impelled. Water or other fluid is admitted 'to'the impeller 1 from a pipe through the nipple ,7, 'preferr ably by gravity from a higher head, but can also be drawn into the impeller by suction if f a packed or Water-tight j oint is providedat 8,

in the usual manner of such'devices. 1

For high heads, to which the apparatus is especially adapted, the. discharge-casing 4. is reinforced by ribs 9 to prevent the throat 3 from expanding by pressure'and is provided with adischarge-nipple 10, that can be placed at any-point around theperiphery ofthe casing as may be most convenient.

The discharge-chamber 4 and the supplypipe 6 areattached to a base-frame 12 in the usual'manner, and thus maintain a concentric position of the impeller, 1 around the inlet-nipple 7. i 1

In the drawings the machine is shown arranged asa common centrifugal pump; but it'will be understood that except for connec* ,tion to an electric motor a more natural position is to set the spindle 5 ina vertical p0? sition.

The impeller 1 is divided into radial compartments by the partitions or vanes 11, that may be straight or curved, as in Fig. I, but must terminate Within the nozzle-way 2, so as to permita continuous discharge all around the impeller, and thus prevent backfiow from the discharge-casing 4.

By referring to Fig. III it will be seen that the interior chamber of the impeller 1 out to the line .2 is of capacity or section much in excess of that of the inlet-nipple 7 and that the water at this point flows slowly around the tips of the vanes 11, uniting in the zone from c to a, so as to cause a solid and continuous discharge into the throat 3.

The essential feature of the invention resides in the induction-nozzles 2 and 3, a con-- tinuous discharge-way around the impeller, and the resultant modifications that grow out of those features, and I therefore claim as my invention and desire to secure by Letters Patent-- 1. In a centrifugal pump, an annular discharge-chamber, an uninclosed rotary disk impeller mounted concentrically therein, divergent vanes within said impeller forming between them passages expanding toward the periphery in the plane of rotation, said vanes terminating a short distance within the periphery of the impeller to form an annular continuous discharge way at the margin thereof, and a continuous annular throatway on the surrounding discharge-chamber cooperating with said discharge-way, substantially as specified.

2. In a centrifugal pump, an annular discharge-chamber having a compressed throatwayB, in combination wit-h an 'uninclosed rotary disk impeller mounted concentrically within said annulus, compressed at its margin to form a discharge-way 2, adjacent to and. cooperating with said throatway, and

provided with interior divergent vanes form-.

ing expanding passages between them, said vanes terminating a short distance within the periphery of the impeller to give continuity to the an nular discharge-way and. provide for a smoothdelivery, substantially as specified.

3. In a centrifugal pump, an annular discharge-chamber having a compressed throatway, an uninclosed disk impeller mounted concentrically therein, compressed at its margin to form a discharge-way adjacent to and cooperating with said throatway, interior divergent vanes in said impeller forming expanding passages between them, and termimating, short of the compressed margin to form a continuous discharge-way, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN RICHARDS.

Vitnesses:

ALFRED A. ENQUIST, ELMER WIOKES. 

